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                [Usaco2004 Mar]Paranoid Cows 发疯的奶牛                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;约翰有N(1&le;N&le;100000)头奶牛，它们都可以控制自己的产奶量．一头产奶不多的奶牛会被其它奶牛嘲笑,&nbsp;约翰制订一张产奶时间表，第i头奶牛在Ai_Bi时间段里产奶(0&le;Ai&lt;Bi&le;10^9)．这头奶牛必须在Ai的时候进入奶棚在Bi的时候离开．奶棚的门很小，同一时刻只能有一头奶牛通过．&nbsp;如果第i头奶牛产奶的时间段包含第j头奶牛产奶的时间段，即A&lt;Aj&lt;Bj&lt;Bi.那么，我们称这两个时间段是&ldquo;巢段&rdquo;．&nbsp;&nbsp;&ldquo;巢段&rdquo;是一件很糟糕的事，因为第j头奶牛在奶棚的时间里第i头奶牛一直都在．这样第i头奶牛就能估计第j头奶牛的产奶量．由于产奶量被别的奶牛知道了的奶牛会发疯，所以约翰不希望&ldquo;巢段&rdquo;的发生．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;帮助约翰确定最大的k(1&le;K&le;N)，在1到K的奶牛中不存在&ldquo;巢段&rdquo;．</span></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行：奶牛的数量N．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第2到N+1行：每行有两个用空格隔开的数字，表示这头奶牛的产奶时间段．</span></div></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;一个整数K</span></div></p><hr/><h3>样例输入</h3><pre>5
7 20
1 4
3 12
6 10
0 3</pre><hr/><h3>样例输出</h3><pre> 3

样例说明
    第4头奶牛( 6-10)被包含于第3头奶牛(3-12)．另外，1至3头奶牛不存在“巢段”</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Orange</p>
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